/*
 * Copyright 2008 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ccsoft.mc.core.interceptor.impl;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.*;
import org.ccsoft.mc.core.Interceptor;
import org.ccsoft.mc.core.InvocationContext;
import org.ccsoft.mc.core.exceptions.ServiceInterceptorCreateException;
/**
 * 
 * @author Chao Cai
 *
 * inject the interceptor instance to the service instance
 */
public class ServiceInterceptorProxy implements InvocationHandler{
	private Object serviceImp;	
	private Interceptor interceptor;
	public static Object newInstance(Object obj,String service,Interceptor interceptor){
		ClassLoader loader=obj.getClass().getClassLoader();
		try {
			return Proxy.newProxyInstance(loader
					,new Class []{loader.loadClass(service)},new ServiceInterceptorProxy(obj,interceptor));
		} catch (Exception e) {
			throw new ServiceInterceptorCreateException(e);
		} 
		
	}
	private ServiceInterceptorProxy(Object obj,Interceptor interceptor) {
		serviceImp=obj;
		this.interceptor=interceptor;
	}
   
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		InovactionContextImpl ctx=new InovactionContextImpl();
		ctx.setMethod(method);
		ctx.setParamters(args);
		ctx.setTarget(serviceImp);
		return interceptor.invoke(ctx);		
	}   
}
